The enclosing upper shoe with function-specific zones and scientifically optimized materials ensures outstanding fit and pedal performance. Two flat BOA® Li2 rotary closures allow for precise micro-adjustment. The lower rotary closure is also secured against accidental release from impacts. The lightweight SHIMANO ULTREAD XC rubber outsole with a special tread pattern offers exceptional grip during races. The flat midsole stabilizes the foot and optimizes power transfer. The heel cap with anti-twist protection ensures optimal foot positioning during strong acceleration and high cadences.